In a statement released to the London Stock Exchange, the company said the integration of Tui AG and the former Tui Travel had progressed “faster than originally envisaged”.

The group said Lundgren, who was also managing director mainstream markets, having been fully involved in the design and supportive of the new structure “had taken the decision that he does not want to take up a role within it”.

“He believes that now is the appropriate time to step down from the executive Board and leave the Group, which he will do effective as of [May 31, 2015],” he added.

As part of the restructure, business operations will be grouped into three regions in future, Northern Region, Central Region and Western Region.

David Burling, managing director Tui UK and Ireland and member of the group executive committee, will join the executive board with effect from June 1 2015. He will assume overall responsibility for the UK and Ireland, Nordics (Sweden, Norway, Finland and Denmark), Canada and Russia, as well as the group divisions for product & purchasing and aviation platforms.

Following David Burling’s promotion, Nick Longman, currently mainstream distribution & online director, is appointed managing director Tui UK and Ireland. His current team will move into group marketing.

For the Central Region, Sebastian Ebel’s executive responsibilities will be extended and in the Western Region, Ellie Bruyninckx, managing director Benelux, will join the group executive committee as a new member overseeing the Western Region.

Peter Long, joint-chief executive of Tui Group and former chief executive of Tui Travel said: “I am very sad that Johan has decided that he now wishes to leave the business to pursue new challenges outside the Group and I wish him every success for the future. He has been a key executive both within Tui Travel and more recently the Tui Group.

Johan Lundgren added: “I have thoroughly enjoyed my time with Tui and I am very proud of what we have achieved. I have relished the roles I have taken, playing a part in growing the business and delivering value to all stakeholders. This has been a very difficult decision for me to make but I am firmly of the opinion that now is the right time to leave the company and pursue my next opportunity outside the world of Tui."